[PATCH] befs: debugging code cleanup

From: "Sergey S. Kostyliov" <rathamahata@php4.ru>

- Reduce stack usage.
- Kill useless duplication of error and warning messages when debug is on. Old
	behaviour was:
...
BeFS(hda1): 

fs/befs/debug.c

@@ -29,22 +29,29 @@ void
 befs_error(const struct super_block *sb, const char *fmt, ...)
 {
 	va_list args;
-	char err_buf[ERRBUFSIZE];
+	char *err_buf = (char *) kmalloc(ERRBUFSIZE, GFP_KERNEL);
+	if (err_buf == NULL) {
+		printk(KERN_ERR "could not allocate %d bytes\n", ERRBUFSIZE);
+		return;
+	}
 
 	va_start(args, fmt);
 	vsnprintf(err_buf, ERRBUFSIZE, fmt, args);
 	va_end(args);
 
 	printk(KERN_ERR "BeFS(%s): %s\n", sb->s_id, err_buf);
-
-	befs_debug(sb, err_buf);
+	kfree(err_buf);
 }
 
 void
 befs_warning(const struct super_block *sb, const char *fmt, ...)
 {
 	va_list args;
-	char err_buf[ERRBUFSIZE];
+	char *err_buf = (char *) kmalloc(ERRBUFSIZE, GFP_KERNEL);
+	if (err_buf == NULL) {
+		printk(KERN_ERR "could not allocate %d bytes\n", ERRBUFSIZE);
+		return;
+	}
 
 	va_start(args, fmt);
 	vsnprintf(err_buf, ERRBUFSIZE, fmt, args);
@@ -52,7 +59,7 @@ befs_warning(const struct super_block *sb, const char *fmt, ...)
 
 	printk(KERN_WARNING "BeFS(%s): %s\n", sb->s_id, err_buf);
 
-	befs_debug(sb, err_buf);
+	kfree(err_buf);
 }
 
 void
@@ -61,15 +68,25 @@ befs_debug(const struct super_block *sb, const char *fmt, ...)
 #ifdef CONFIG_BEFS_DEBUG
 
 	va_list args;
-	char err_buf[ERRBUFSIZE];
+	char *err_buf = NULL;
 
 	if (BEFS_SB(sb)->mount_opts.debug) {
+		err_buf = (char *) kmalloc(ERRBUFSIZE, GFP_KERNEL);
+		if (err_buf == NULL) {
+			printk(KERN_ERR "could not allocate %d bytes\n",
+				ERRBUFSIZE);
+			return;
+		}
+
 		va_start(args, fmt);
 		vsnprintf(err_buf, ERRBUFSIZE, fmt, args);
 		va_end(args);
 
 		printk(KERN_DEBUG "BeFS(%s): %s\n", sb->s_id, err_buf);
+
+		kfree(err_buf);
 	}
+
 #endif				//CONFIG_BEFS_DEBUG
 }